iGen_DesignersGuide_lowres
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Finish/Smoothness<br />
Finish is the smoothness or roughness of a paper’s surface. Paper is<br />
processed to have a specific type of finish, ranging from very smooth to<br />
highly textured. Finish can significantly impact image quality. If paper is too<br />
rough, light patches and graininess appear in solid areas. Halftone images<br />
also appear grainy. Dry ink may not fuse properly to extremely rough paper,<br />
which may cause deletions where the ink rubs or flakes off. Smooth and<br />
coated papers produce sharp images because they reflect light more directly<br />
than rougher papers.<br />
Sheffield is a test that is used to measure the smoothness of paper. It<br />
measures the rate of air flow over the surface of a sheet. The lower the<br />
Sheffield smoothness number, the smoother the sheet.<br />
The following two tables provide descriptions of the paper finish categories<br />
and descriptions of the coating categories.<br />
18 Digital Printing Reference